Biomass-derived multiatom-doped carbon dots for the photocatalytic reduction of Cr(VI) and precipitation of Cr(III)

IF 10.4 1区工程技术 Q1 ENGINEERING, CHEMICAL

npj Clean Water Pub Date : 2024-12-24 DOI:10.1038/s41545-024-00426-2

Gunture, Tae Yoon Lee

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Abstract

The release of heavy metal ions, especially hexavalent chromium [Cr(VI)], from industrial processes poses significant health and environmental risks. Cr(VI) does not readily degrade but can be reduced to the less toxic trivalent form [Cr(III)] that exhibits lower adsorption, making it easier to manage and remove from environmental systems. This paper proposes a single-step solvothermal method to synthesize fluorescent multiatom-doped (N, K, Cl, Mg, and Ca) carbon dots (MACDs) from Kalanchoe pinnata leaves (carbon precursor) and ethanol (solvent). These MACDs serve as effective photocatalysts for Cr(VI) reduction under one sun illumination (AM 1.5 G conditions). The reaction achieved a 91% Cr(VI) removal from a 20 ppm deionized water solution in 420 min and complete removal (100%) in an acidic solution with the same initial concentration in 120 min. The MACDs demonstrated excellent photocatalytic performance across tap, river, and lake water. These biomass-derived MACDs demonstrate strong potential for effective Cr-contaminated water remediation.

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生物质源多原子掺杂碳点光催化还原Cr（VI）和沉淀Cr（III）

工业过程释放的重金属离子，特别是六价铬[Cr(VI)]，构成重大的健康和环境风险。Cr（VI）不易降解，但可以还原为毒性较小的三价形式[Cr(III)]，其吸附性较低，使其更容易管理和从环境系统中去除。提出了一种单步溶剂热法制备多原子掺杂（N、K、Cl、Mg、Ca）碳点（MACDs）的方法。这些macd在一次阳光照射（AM 1.5 G条件下）下作为Cr（VI）还原的有效光催化剂。在20 ppm的去离子水溶液中，反应时间为420 min， Cr（VI）去除率为91%；在相同初始浓度的酸性溶液中，反应时间为120 min， Cr（VI）去除率为100%。macd在自来水、河流和湖水中表现出优异的光催化性能。这些生物质来源的macd显示了有效修复cr污染水的强大潜力。

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来源期刊

npj Clean Water Environmental Science-Water Science and Technology

CiteScore

15.30

自引率

2.60%

发文量

审稿时长

5 weeks

期刊介绍： npj Clean Water publishes high-quality papers that report cutting-edge science, technology, applications, policies, and societal issues contributing to a more sustainable supply of clean water. The journal's publications may also support and accelerate the achievement of Sustainable Development Goal 6, which focuses on clean water and sanitation.